Masturbating/ Orgasm

so ladiessss, i started masturbating maybe a year, two years ago? and everytime i find the RIGHTT spot, and i’m about to finish, my whole body starts to get tight and curl up, and i flinch my finger away. are there any tips that might help me stop moving away from climaxing? i recently bought a vibrator and ive learned my clit is veryyyy sensitive. i just need help because it feels so good but i can’t move away from the life of me. its an overwhelming sensation. please help!!!